diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..167fe26
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,5 @@
+{
+    "chat.tools.terminal.autoApprove": {
+        "uvicorn": true
+    }
+}
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
index 97dc7cd..2522ad0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,4 @@
 fastapi
 uvicorn
+pytest
+httpx
diff --git a/src/app.py b/src/app.py
index 4ebb1d9..3fc84ee 100644
--- a/src/app.py
+++ b/src/app.py
@@ -38,6 +38,42 @@
         "schedule": "Mondays, Wednesdays, Fridays, 2:00 PM - 3:00 PM",
         "max_participants": 30,
         "participants": ["john@mergington.edu", "olivia@mergington.edu"]
+    },
+    "Soccer Team": {
+        "description": "Join the varsity soccer team and compete in league matches",
+        "schedule": "Mondays and Wednesdays, 4:00 PM - 6:00 PM",
+        "max_participants": 25,
+        "participants": ["liam@mergington.edu", "noah@mergington.edu"]
+    },
+    "Basketball Team": {
+        "description": "Practice basketball skills and play competitive games",
+        "schedule": "Tuesdays and Thursdays, 4:00 PM - 6:00 PM",
+        "max_participants": 15,
+        "participants": ["ava@mergington.edu", "isabella@mergington.edu"]
+    },
+    "Drama Club": {
+        "description": "Perform in theatrical productions and develop acting skills",
+        "schedule": "Thursdays, 3:30 PM - 5:30 PM",
+        "max_participants": 25,
+        "participants": ["mia@mergington.edu", "charlotte@mergington.edu"]
+    },
+    "Art Club": {
+        "description": "Explore various art mediums including painting, drawing, and sculpture",
+        "schedule": "Wednesdays, 3:30 PM - 5:00 PM",
+        "max_participants": 18,
+        "participants": ["ethan@mergington.edu", "amelia@mergington.edu"]
+    },
+    "Debate Team": {
+        "description": "Develop critical thinking and public speaking skills through competitive debates",
+        "schedule": "Tuesdays, 3:30 PM - 5:00 PM",
+        "max_participants": 16,
+        "participants": ["james@mergington.edu", "harper@mergington.edu"]
+    },
+    "Science Club": {
+        "description": "Conduct experiments and explore scientific concepts through hands-on projects",
+        "schedule": "Fridays, 3:30 PM - 5:00 PM",
+        "max_participants": 20,
+        "participants": ["benjamin@mergington.edu", "evelyn@mergington.edu"]
     }
 }
 
@@ -62,6 +98,29 @@ def signup_for_activity(activity_name: str, email: str):
     # Get the specific activity
     activity = activities[activity_name]
 
+    # Validate student is not already signed up
+    if email in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Student already signed up for this activity")
+
     # Add student
     activity["participants"].append(email)
     return {"message": f"Signed up {email} for {activity_name}"}
+
+
+@app.delete("/activities/{activity_name}/unregister")
+def unregister_from_activity(activity_name: str, email: str):
+    """Unregister a student from an activity"""
+    # Validate activity exists
+    if activity_name not in activities:
+        raise HTTPException(status_code=404, detail="Activity not found")
+
+    # Get the specific activity
+    activity = activities[activity_name]
+
+    # Validate student is signed up
+    if email not in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Student not signed up for this activity")
+
+    # Remove student
+    activity["participants"].remove(email)
+    return {"message": f"Unregistered {email} from {activity_name}"}
diff --git a/src/static/app.js b/src/static/app.js
index dcc1e38..b781e29 100644
--- a/src/static/app.js
+++ b/src/static/app.js
@@ -12,6 +12,9 @@ document.addEventListener("DOMContentLoaded", () => {
 
       // Clear loading message
       activitiesList.innerHTML = "";
+      
+      // Clear and reset activity dropdown
+      activitySelect.innerHTML = '<option value="">-- Select an activity --</option>';
 
       // Populate activities list
       Object.entries(activities).forEach(([name, details]) => {
@@ -25,10 +28,41 @@ document.addEventListener("DOMContentLoaded", () => {
           <p>${details.description}</p>
           <p><strong>Schedule:</strong> ${details.schedule}</p>
           <p><strong>Availability:</strong> ${spotsLeft} spots left</p>
+          <div class="participants-section">
+            <strong>Participants:</strong>
+            ${details.participants.length > 0 
+              ? `<ul class="participants-list">
+                  ${details.participants.map(email => `<li>${email} <button class="delete-btn" data-activity="${name}" data-email="${email}">×</button></li>`).join('')}
+                 </ul>`
+              : `<p class="no-participants">No participants yet. Be the first to sign up!</p>`
+            }
+          </div>
         `;
 
         activitiesList.appendChild(activityCard);
 
+        // Add event listeners for delete buttons
+        activityCard.querySelectorAll('.delete-btn').forEach(btn => {
+          btn.addEventListener('click', async () => {
+            const activity = btn.dataset.activity;
+            const email = btn.dataset.email;
+            try {
+              const response = await fetch(`/activities/${encodeURIComponent(activity)}/unregister?email=${encodeURIComponent(email)}`, {
+                method: 'DELETE'
+              });
+              const result = await response.json();
+              if (response.ok) {
+                fetchActivities(); // Refresh activities list
+              } else {
+                alert(result.detail || 'An error occurred');
+              }
+            } catch (error) {
+              alert('Failed to unregister. Please try again.');
+              console.error('Error unregistering:', error);
+            }
+          });
+        });
+
         // Add option to select dropdown
         const option = document.createElement("option");
         option.value = name;
@@ -62,6 +96,9 @@ document.addEventListener("DOMContentLoaded", () => {
         messageDiv.textContent = result.message;
         messageDiv.className = "success";
         signupForm.reset();
+        
+        // Refresh activities list to show updated participants
+        fetchActivities();
       } else {
         messageDiv.textContent = result.detail || "An error occurred";
         messageDiv.className = "error";
diff --git a/src/static/styles.css b/src/static/styles.css
index a533b32..93cf129 100644
--- a/src/static/styles.css
+++ b/src/static/styles.css
@@ -74,6 +74,54 @@ section h3 {
   margin-bottom: 8px;
 }
 
+.participants-section {
+  margin-top: 15px;
+  padding-top: 15px;
+  border-top: 1px solid #e0e0e0;
+}
+
+.participants-section strong {
+  display: block;
+  margin-bottom: 8px;
+  color: #1a237e;
+}
+
+.participants-list {
+  list-style-type: none;
+  padding-left: 0;
+  margin: 0;
+}
+
+.participants-list li {
+  padding: 3px 0;
+  color: #555;
+  font-size: 14px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.delete-btn {
+  background: none;
+  border: none;
+  color: #d32f2f;
+  cursor: pointer;
+  font-size: 16px;
+  font-weight: bold;
+  padding: 0 5px;
+}
+
+.delete-btn:hover {
+  color: #b71c1c;
+}
+
+.no-participants {
+  font-style: italic;
+  color: #999;
+  margin: 0;
+  font-size: 14px;
+}
+
 .form-group {
   margin-bottom: 15px;
 }
diff --git a/tests/test_app.py b/tests/test_app.py
new file mode 100644
index 0000000..e85c128
--- /dev/null
+++ b/tests/test_app.py
@@ -0,0 +1,73 @@
+import pytest
+from httpx import AsyncClient
+from src.app import app
+
+@pytest.mark.asyncio
+async def test_get_activities():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.get("/activities")
+        assert response.status_code == 200
+        data = response.json()
+        assert "Chess Club" in data
+        assert "participants" in data["Chess Club"]
+
+@pytest.mark.asyncio
+async def test_root_redirect():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.get("/")
+        assert response.status_code == 307  # Redirect
+        assert response.headers["location"] == "/static/index.html"
+
+@pytest.mark.asyncio
+async def test_signup_success():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.post("/activities/Chess%20Club/signup?email=test@mergington.edu")
+        assert response.status_code == 200
+        data = response.json()
+        assert "Signed up" in data["message"]
+
+@pytest.mark.asyncio
+async def test_signup_already_signed():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        # First signup
+        await client.post("/activities/Chess%20Club/signup?email=test2@mergington.edu")
+        # Second
+        response = await client.post("/activities/Chess%20Club/signup?email=test2@mergington.edu")
+        assert response.status_code == 400
+        data = response.json()
+        assert "already signed up" in data["detail"]
+
+@pytest.mark.asyncio
+async def test_signup_activity_not_found():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.post("/activities/NonExistent/signup?email=test@mergington.edu")
+        assert response.status_code == 404
+        data = response.json()
+        assert "Activity not found" in data["detail"]
+
+@pytest.mark.asyncio
+async def test_unregister_success():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        # Signup first
+        await client.post("/activities/Chess%20Club/signup?email=unreg@mergington.edu")
+        # Unregister
+        response = await client.delete("/activities/Chess%20Club/unregister?email=unreg@mergington.edu")
+        assert response.status_code == 200
+        data = response.json()
+        assert "Unregistered" in data["message"]
+
+@pytest.mark.asyncio
+async def test_unregister_not_signed():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.delete("/activities/Chess%20Club/unregister?email=notsigned@mergington.edu")
+        assert response.status_code == 400
+        data = response.json()
+        assert "not signed up" in data["detail"]
+
+@pytest.mark.asyncio
+async def test_unregister_activity_not_found():
+    async with AsyncClient(app=app, base_url="http://testserver") as client:
+        response = await client.delete("/activities/NonExistent/unregister?email=test@mergington.edu")
+        assert response.status_code == 404
+        data = response.json()
+        assert "Activity not found" in data["detail"]
\ No newline at end of file